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block: kill GENHD_FL_FAIL and use part0->make_it_fail
[mirror_ubuntu-bionic-kernel.git] / include / linux / genhd.h
CommitLineData
1da177e4
LT		 1#ifndef _LINUX_GENHD_H
2#define _LINUX_GENHD_H
3
4/*
5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
7 * Drew Eckhardt
8 *
9 * <drew@colorado.edu>
10 */
11
1da177e4 12#include <linux/types.h>
edfaa7c3 13#include <linux/kdev_t.h>
e71bf0d0 14#include <linux/rcupdate.h>
1da177e4 15
9361401e
DH		 16#ifdef CONFIG_BLOCK
17
ed9e1982 18#define kobj_to_dev(k) container_of((k), struct device, kobj)
548b10eb 19#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 20#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 21#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 22#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 23
edfaa7c3
KS		 24extern struct device_type part_type;
25extern struct kobject *block_depr;
26extern struct class block_class;
27
a0db701a
AB		 28extern const struct seq_operations partitions_op;
29extern const struct seq_operations diskstats_op;
30
1da177e4
LT		 31enum {
32/* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION = 5,
35 LINUX_EXTENDED_PARTITION = 0x85,
36 WIN98_EXTENDED_PARTITION = 0x0f,
37
d18d7682
FMDN		 38 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
39
1da177e4 40 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 41 LINUX_DATA_PARTITION = 0x83,
42 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 43 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
44
45 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
46 NEW_SOLARIS_X86_PARTITION = 0xbf,
47
48 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION = 0x55, /* EZ-DRIVE */
52
53 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION = 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59};
60
34186efc
DW		 61#include <linux/major.h>
62#include <linux/device.h>
63#include <linux/smp.h>
64#include <linux/string.h>
65#include <linux/fs.h>
8ce7ad7b 66#include <linux/workqueue.h>
34186efc 67
1da177e4
LT		 68struct partition {
69 unsigned char boot_ind; /* 0x80 - active */
70 unsigned char head; /* starting head */
71 unsigned char sector; /* starting sector */
72 unsigned char cyl; /* starting cylinder */
73 unsigned char sys_ind; /* What partition type */
74 unsigned char end_head; /* end head */
75 unsigned char end_sector; /* end sector */
76 unsigned char end_cyl; /* end cylinder */
77 __le32 start_sect; /* starting sector counting from 0 */
78 __le32 nr_sects; /* nr of sectors in partition */
79} __attribute__((packed));
80
ea5c48ab
JM		 81struct disk_stats {
82 unsigned long sectors[2]; /* READs and WRITEs */
83 unsigned long ios[2];
84 unsigned long merges[2];
85 unsigned long ticks[2];
86 unsigned long io_ticks;
87 unsigned long time_in_queue;
88};
89
1da177e4
LT		 90struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
ed9e1982 93 struct device __dev;
6a4d44c1 94 struct kobject *holder_dir;
1da177e4 95 int policy, partno;
c17bb495
AM		 96#ifdef CONFIG_FAIL_MAKE_REQUEST
97 int make_it_fail;
ea5c48ab
JM		 98#endif
99 unsigned long stamp;
100 int in_flight;
101#ifdef CONFIG_SMP
102 struct disk_stats *dkstats;
103#else
104 struct disk_stats dkstats;
c17bb495 105#endif
e71bf0d0 106 struct rcu_head rcu_head;
1da177e4
LT		 107};
108
109#define GENHD_FL_REMOVABLE 1
110#define GENHD_FL_DRIVERFS 2
86ce18d7 111#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 112#define GENHD_FL_CD 8
113#define GENHD_FL_UP 16
114#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
115
1da177e4 116struct gendisk {
bcce3de1
TH		 117 /* major, first_minor, minors and ext_minors are input
118 * parameters only, don't use directly. Use disk_devt() and
119 * disk_max_parts().
f331c029 120 */
1da177e4
LT		 121 int major; /* major number of driver */
122 int first_minor;
123 int minors; /* maximum number of minors, =1 for
124 * disks that can't be partitioned. */
bcce3de1 125 int ext_minors; /* number of extended dynamic minors */
f331c029 126
1da177e4 127 char disk_name[32]; /* name of major driver */
e71bf0d0 128
b5d0b9df 129 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 130 * Protected with matching bdev lock but stat and other
131 * non-critical accesses use RCU. Always access through
132 * helpers.
133 */
134 struct hd_struct **__part;
b5d0b9df 135 struct hd_struct part0;
e71bf0d0 136
1da177e4
LT		 137 struct block_device_operations *fops;
138 struct request_queue *queue;
139 void *private_data;
1da177e4
LT		 140
141 int flags;
edfaa7c3 142 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 143 struct kobject *slave_dir;
1da177e4
LT		 144
145 struct timer_rand_state *random;
1da177e4
LT		 146
147 atomic_t sync_io; /* RAID */
20e5c81f 148 unsigned long stamp;
1da177e4
LT		 149 int in_flight;
150#ifdef CONFIG_SMP
151 struct disk_stats *dkstats;
152#else
153 struct disk_stats dkstats;
154#endif
8ce7ad7b 155 struct work_struct async_notify;
7ba1ba12
MP		 156#ifdef CONFIG_BLK_DEV_INTEGRITY
157 struct blk_integrity *integrity;
158#endif
1da177e4
LT		 159};
160
310a2c10
TH		 161static inline struct gendisk *part_to_disk(struct hd_struct *part)
162{
548b10eb
TH		 163 if (likely(part)) {
164 if (part->partno)
165 return dev_to_disk(part_to_dev(part)->parent);
166 else
167 return dev_to_disk(part_to_dev(part));
168 }
310a2c10
TH		 169 return NULL;
170}
171
f331c029
TH		 172static inline int disk_max_parts(struct gendisk *disk)
173{
b5d0b9df
TH		 174 return disk->minors + disk->ext_minors;
175}
176
177static inline bool disk_partitionable(struct gendisk *disk)
178{
179 return disk_max_parts(disk) > 1;
f331c029
TH		 180}
181
182static inline dev_t disk_devt(struct gendisk *disk)
183{
ed9e1982 184 return disk_to_dev(disk)->devt;
f331c029
TH		 185}
186
187static inline dev_t part_devt(struct hd_struct *part)
188{
ed9e1982 189 return part_to_dev(part)->devt;
f331c029
TH		 190}
191
e71bf0d0
TH		 192extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
193
194static inline void disk_put_part(struct hd_struct *part)
195{
196 if (likely(part))
ed9e1982 197 put_device(part_to_dev(part));
e71bf0d0
TH		 198}
199
200/*
201 * Smarter partition iterator without context limits.
202 */
203#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
204#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 205#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0
TH		 206
207struct disk_part_iter {
208 struct gendisk *disk;
209 struct hd_struct *part;
210 int idx;
211 unsigned int flags;
212};
213
214extern void disk_part_iter_init(struct disk_part_iter *piter,
215 struct gendisk *disk, unsigned int flags);
216extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
217extern void disk_part_iter_exit(struct disk_part_iter *piter);
218
219extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
220 sector_t sector);
221
c9959059 222/*
1da177e4
LT		 223 * Macros to operate on percpu disk statistics:
224 *
c9959059
TH		 225 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
226 * and should be called between disk_stat_lock() and
227 * disk_stat_unlock().
228 *
229 * part_stat_read() can be called at any time.
230 *
231 * part_stat_{add|set_all}() and {init|free}_part_stats are for
232 * internal use only.
1da177e4
LT		 233 */
234#ifdef CONFIG_SMP
c9959059
TH		 235#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
236#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
237
238#define disk_stat_add(cpu, gendiskp, field, addnd) \
239 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
1da177e4
LT		 240
241#define disk_stat_read(gendiskp, field) \
242({ \
243 typeof(gendiskp->dkstats->field) res = 0; \
244 int i; \
0a945022 245 for_each_possible_cpu(i) \
1da177e4 246 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4
LT		 247 res; \
248})
249
c9959059
TH		 250static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
251{
1da177e4 252 int i;
28f13702 253
0a945022 254 for_each_possible_cpu(i)
394e3902 255 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
28f13702 256 sizeof(struct disk_stats));
1da177e4 257}
ea5c48ab 258
c9959059
TH		 259#define part_stat_add(cpu, part, field, addnd) \
260 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
ea5c48ab 261
c9959059
TH		 262#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
263({ \
264 if (part) \
265 part_stat_add(cpu, part, field, addnd); \
266 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 267})
268
269#define part_stat_read(part, field) \
270({ \
271 typeof(part->dkstats->field) res = 0; \
272 int i; \
273 for_each_possible_cpu(i) \
274 res += per_cpu_ptr(part->dkstats, i)->field; \
275 res; \
276})
277
28f13702
JA		 278static inline void part_stat_set_all(struct hd_struct *part, int value)
279{
ea5c48ab 280 int i;
28f13702 281
ea5c48ab
JM		 282 for_each_possible_cpu(i)
283 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 284 sizeof(struct disk_stats));
ea5c48ab 285}
c9959059 286
a8ae50ba 287#else /* !CONFIG_SMP */
c9959059
TH		 288#define disk_stat_lock() ({ rcu_read_lock(); 0; })
289#define disk_stat_unlock() rcu_read_unlock()
290
291#define disk_stat_add(cpu, gendiskp, field, addnd) \
292 (gendiskp->dkstats.field += addnd)
1da177e4
LT		 293#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
294
ea5c48ab
JM		 295static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
296{
1da177e4
LT		 297 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
298}
ea5c48ab 299
c9959059 300#define part_stat_add(cpu, part, field, addnd) \
ea5c48ab
JM		 301 (part->dkstats.field += addnd)
302
c9959059
TH		 303#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
304({ \
305 if (part) \
306 part_stat_add(cpu, part, field, addnd); \
307 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 308})
309
310#define part_stat_read(part, field) (part->dkstats.field)
311
312static inline void part_stat_set_all(struct hd_struct *part, int value)
313{
314 memset(&part->dkstats, value, sizeof(struct disk_stats));
315}
316
a8ae50ba 317#endif /* CONFIG_SMP */
1da177e4 318
c9959059
TH		 319#define disk_stat_dec(cpu, gendiskp, field) \
320 disk_stat_add(cpu, gendiskp, field, -1)
321#define disk_stat_inc(cpu, gendiskp, field) \
322 disk_stat_add(cpu, gendiskp, field, 1)
323#define disk_stat_sub(cpu, gendiskp, field, subnd) \
324 disk_stat_add(cpu, gendiskp, field, -subnd)
325
326#define part_stat_dec(cpu, gendiskp, field) \
327 part_stat_add(cpu, gendiskp, field, -1)
328#define part_stat_inc(cpu, gendiskp, field) \
329 part_stat_add(cpu, gendiskp, field, 1)
330#define part_stat_sub(cpu, gendiskp, field, subnd) \
331 part_stat_add(cpu, gendiskp, field, -subnd)
332
333#define all_stat_dec(cpu, gendiskp, field, sector) \
334 all_stat_add(cpu, gendiskp, field, -1, sector)
335#define all_stat_inc(cpu, gendiskp, part, field, sector) \
336 all_stat_add(cpu, gendiskp, part, field, 1, sector)
337#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
338 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
1da177e4
LT		 339
340/* Inlines to alloc and free disk stats in struct gendisk */
341#ifdef CONFIG_SMP
342static inline int init_disk_stats(struct gendisk *disk)
343{
344 disk->dkstats = alloc_percpu(struct disk_stats);
345 if (!disk->dkstats)
346 return 0;
347 return 1;
348}
349
350static inline void free_disk_stats(struct gendisk *disk)
351{
352 free_percpu(disk->dkstats);
353}
ea5c48ab
JM		 354
355static inline int init_part_stats(struct hd_struct *part)
356{
357 part->dkstats = alloc_percpu(struct disk_stats);
358 if (!part->dkstats)
359 return 0;
360 return 1;
361}
362
363static inline void free_part_stats(struct hd_struct *part)
364{
365 free_percpu(part->dkstats);
366}
367
1da177e4
LT		 368#else /* CONFIG_SMP */
369static inline int init_disk_stats(struct gendisk *disk)
370{
371 return 1;
372}
373
374static inline void free_disk_stats(struct gendisk *disk)
375{
376}
ea5c48ab
JM		 377
378static inline int init_part_stats(struct hd_struct *part)
379{
380 return 1;
381}
382
383static inline void free_part_stats(struct hd_struct *part)
384{
385}
1da177e4
LT		 386#endif /* CONFIG_SMP */
387
388/* drivers/block/ll_rw_blk.c */
c9959059
TH		 389extern void disk_round_stats(int cpu, struct gendisk *disk);
390extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 391
392/* drivers/block/genhd.c */
ac20427e 393extern int get_blkdev_list(char *, int);
1da177e4
LT		 394extern void add_disk(struct gendisk *disk);
395extern void del_gendisk(struct gendisk *gp);
396extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 397extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 398extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 399
400extern void set_device_ro(struct block_device *bdev, int flag);
401extern void set_disk_ro(struct gendisk *disk, int flag);
402
b7db9956
TH		 403static inline int get_disk_ro(struct gendisk *disk)
404{
405 return disk->part0.policy;
406}
407
1da177e4
LT		 408/* drivers/char/random.c */
409extern void add_disk_randomness(struct gendisk *disk);
410extern void rand_initialize_disk(struct gendisk *disk);
411
412static inline sector_t get_start_sect(struct block_device *bdev)
413{
0762b8bd 414 return bdev->bd_part->start_sect;
1da177e4
LT		 415}
416static inline sector_t get_capacity(struct gendisk *disk)
417{
80795aef 418 return disk->part0.nr_sects;
1da177e4
LT		 419}
420static inline void set_capacity(struct gendisk *disk, sector_t size)
421{
80795aef 422 disk->part0.nr_sects = size;
1da177e4
LT		 423}
424
1da177e4
LT		 425#ifdef CONFIG_SOLARIS_X86_PARTITION
426
b84d8796 427#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 428#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
429
430struct solaris_x86_slice {
431 __le16 s_tag; /* ID tag of partition */
432 __le16 s_flag; /* permission flags */
433 __le32 s_start; /* start sector no of partition */
434 __le32 s_size; /* # of blocks in partition */
435};
436
437struct solaris_x86_vtoc {
438 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
439 __le32 v_sanity; /* to verify vtoc sanity */
440 __le32 v_version; /* layout version */
441 char v_volume[8]; /* volume name */
442 __le16 v_sectorsz; /* sector size in bytes */
443 __le16 v_nparts; /* number of partitions */
444 unsigned int v_reserved[10]; /* free space */
445 struct solaris_x86_slice
446 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
447 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
448 char v_asciilabel[128]; /* for compatibility */
449};
450
451#endif /* CONFIG_SOLARIS_X86_PARTITION */
452
453#ifdef CONFIG_BSD_DISKLABEL
454/*
455 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
456 * updated by Marc Espie <Marc.Espie@openbsd.org>
457 */
458
459/* check against BSD src/sys/sys/disklabel.h for consistency */
460
461#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
462#define BSD_MAXPARTITIONS 16
463#define OPENBSD_MAXPARTITIONS 16
464#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
465struct bsd_disklabel {
466 __le32 d_magic; /* the magic number */
467 __s16 d_type; /* drive type */
468 __s16 d_subtype; /* controller/d_type specific */
469 char d_typename[16]; /* type name, e.g. "eagle" */
470 char d_packname[16]; /* pack identifier */
471 __u32 d_secsize; /* # of bytes per sector */
472 __u32 d_nsectors; /* # of data sectors per track */
473 __u32 d_ntracks; /* # of tracks per cylinder */
474 __u32 d_ncylinders; /* # of data cylinders per unit */
475 __u32 d_secpercyl; /* # of data sectors per cylinder */
476 __u32 d_secperunit; /* # of data sectors per unit */
477 __u16 d_sparespertrack; /* # of spare sectors per track */
478 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
479 __u32 d_acylinders; /* # of alt. cylinders per unit */
480 __u16 d_rpm; /* rotational speed */
481 __u16 d_interleave; /* hardware sector interleave */
482 __u16 d_trackskew; /* sector 0 skew, per track */
483 __u16 d_cylskew; /* sector 0 skew, per cylinder */
484 __u32 d_headswitch; /* head switch time, usec */
485 __u32 d_trkseek; /* track-to-track seek, usec */
486 __u32 d_flags; /* generic flags */
487#define NDDATA 5
488 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
489#define NSPARE 5
490 __u32 d_spare[NSPARE]; /* reserved for future use */
491 __le32 d_magic2; /* the magic number (again) */
492 __le16 d_checksum; /* xor of data incl. partitions */
493
494 /* filesystem and partition information: */
495 __le16 d_npartitions; /* number of partitions in following */
496 __le32 d_bbsize; /* size of boot area at sn0, bytes */
497 __le32 d_sbsize; /* max size of fs superblock, bytes */
498 struct bsd_partition { /* the partition table */
499 __le32 p_size; /* number of sectors in partition */
500 __le32 p_offset; /* starting sector */
501 __le32 p_fsize; /* filesystem basic fragment size */
502 __u8 p_fstype; /* filesystem type, see below */
503 __u8 p_frag; /* filesystem fragments per block */
504 __le16 p_cpg; /* filesystem cylinders per group */
505 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
506};
507
508#endif /* CONFIG_BSD_DISKLABEL */
509
510#ifdef CONFIG_UNIXWARE_DISKLABEL
511/*
512 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
513 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
514 */
515
516#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
517#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
518#define UNIXWARE_NUMSLICE 16
519#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
520
521struct unixware_slice {
522 __le16 s_label; /* label */
523 __le16 s_flags; /* permission flags */
524 __le32 start_sect; /* starting sector */
525 __le32 nr_sects; /* number of sectors in slice */
526};
527
528struct unixware_disklabel {
529 __le32 d_type; /* drive type */
530 __le32 d_magic; /* the magic number */
531 __le32 d_version; /* version number */
532 char d_serial[12]; /* serial number of the device */
533 __le32 d_ncylinders; /* # of data cylinders per device */
534 __le32 d_ntracks; /* # of tracks per cylinder */
535 __le32 d_nsectors; /* # of data sectors per track */
536 __le32 d_secsize; /* # of bytes per sector */
537 __le32 d_part_start; /* # of first sector of this partition */
538 __le32 d_unknown1[12]; /* ? */
539 __le32 d_alt_tbl; /* byte offset of alternate table */
540 __le32 d_alt_len; /* byte length of alternate table */
541 __le32 d_phys_cyl; /* # of physical cylinders per device */
542 __le32 d_phys_trk; /* # of physical tracks per cylinder */
543 __le32 d_phys_sec; /* # of physical sectors per track */
544 __le32 d_phys_bytes; /* # of physical bytes per sector */
545 __le32 d_unknown2; /* ? */
546 __le32 d_unknown3; /* ? */
547 __le32 d_pad[8]; /* pad */
548
549 struct unixware_vtoc {
550 __le32 v_magic; /* the magic number */
551 __le32 v_version; /* version number */
552 char v_name[8]; /* volume name */
553 __le16 v_nslices; /* # of slices */
554 __le16 v_unknown1; /* ? */
555 __le32 v_reserved[10]; /* reserved */
556 struct unixware_slice
557 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
558 } vtoc;
559
560}; /* 408 */
561
562#endif /* CONFIG_UNIXWARE_DISKLABEL */
563
564#ifdef CONFIG_MINIX_SUBPARTITION
565# define MINIX_NR_SUBPARTITIONS 4
566#endif /* CONFIG_MINIX_SUBPARTITION */
567
d18d7682
FMDN		 568#define ADDPART_FLAG_NONE 0
569#define ADDPART_FLAG_RAID 1
570#define ADDPART_FLAG_WHOLEDISK 2
571
bcce3de1
TH		 572extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
573extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 574extern dev_t blk_lookup_devt(const char *name, int partno);
575extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4
LT		 576
577extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 578extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 579extern void delete_partition(struct gendisk *, int);
dd2a345f 580extern void printk_all_partitions(void);
1da177e4 581
1946089a 582extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 583extern struct gendisk *alloc_disk(int minors);
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TH		 584extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
585 int node_id);
586extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
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LT		 587extern struct kobject *get_disk(struct gendisk *disk);
588extern void put_disk(struct gendisk *disk);
edfaa7c3 589extern void blk_register_region(dev_t devt, unsigned long range,
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LT		 590 struct module *module,
591 struct kobject *(*probe)(dev_t, int *, void *),
592 int (*lock)(dev_t, void *),
593 void *data);
edfaa7c3 594extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 595
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TH		 596extern ssize_t part_size_show(struct device *dev,
597 struct device_attribute *attr, char *buf);
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TH		 598#ifdef CONFIG_FAIL_MAKE_REQUEST
599extern ssize_t part_fail_show(struct device *dev,
600 struct device_attribute *attr, char *buf);
601extern ssize_t part_fail_store(struct device *dev,
602 struct device_attribute *attr,
603 const char *buf, size_t count);
604#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521 605
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JA		 606#else /* CONFIG_BLOCK */
607
608static inline void printk_all_partitions(void) { }
609
cf771cb5 610static inline dev_t blk_lookup_devt(const char *name, int partno)
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KS		 611{
612 dev_t devt = MKDEV(0, 0);
613 return devt;
614}
615
87c1efbf 616#endif /* CONFIG_BLOCK */
9361401e 617
a8ae50ba 618#endif /* _LINUX_GENHD_H */
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